#define  _CRT_SECURE_NO_WARNINGS 1

#include<iostream>
#include<vector>
#include<string>
using namespace std;

class Solution {
public:
    vector<vector<int>> generate(int numRows) {
        vector<vector<int>> vv;
        vv.resize(numRows);
        for (size_t i = 0; i < vv.size(); ++i)
        {
            vv[i].resize(i + 1, 0);
            vv[i][0] = vv[i][i] = 1;
        }

        for (size_t i = 0; i < vv.size(); ++i)
        {
            for (size_t j = 0; j < vv[i].size(); ++j)
            {
                if (vv[i][j] == 0)
                {
                    vv[i][j] = vv[i - 1][j] + vv[i - 1][j - 1];
                }
            }
        }
        return vv;
    }
};